Secure your Angular JS Application

Awesome Tips to Secure your Angular JS application


Security of the app is the main concern for any Angular JS developer. The Internet is a place where every code is exposed to the people having a browser and this is what threatens the security of an app. Even with minification, the codes will still be present online. Therefore, some other tactics should be practiced to ensure the security of the Angular JS apps.

Best practices for security

  • Always stay updated with Angular library releases. This will keep the security at its best and allow if any, bugs to be fixed with the help of the updates. You can also keep a regular check on the Angular changelog for any new updates.
  • Try not to modify your copy of Angular JS because there are high chances that the customised versions will not have the important security fixes. This will expose your app to more threats.

Now that we have seen the easy steps to practice for security, let’s discuss the same in detail.

The Cross-site Scripting Issue

The cross-site scripting or XSS issue is the most common security issue for any website. This scripting allows the attacker to add harmful codes to the web pages which will then steal user information from the website. To understand it better, we can assume a situation where a user has to make a comment on a blog. For the same reason, he has to enter his accounts details to log in in order to make the comment. But if the website has been attacked then the user information will go directly to the attackers URL.

Therefore, websites should make sure they prevent the XSS issue. This can be done in the following ways:

  • Use of template injection can ensure the security from XSS bugs.
  • Sanitization is another way by which untrusted value is turned into trusted value so that it can be inserted in the DOM.
  • Using DOM APIs directly may cause harm in many ways. It’s better to stick to the Angular templates instead.
  • Using the Content Security Policy (CSP) is another technique of preventing any attackers.
  • Using offline template injections reduce the chances of being attacked a lot more.
  • Protection of the server side is also important. To do so use templating language and remember to never generate templates on the server.

Trusting values

There are sometimes when apps have to generate executable codes and even generate harmful URLs. In such situations, every mobile app development company should avoid automatic sanitisation of codes in order for those codes to work. To do so, you can tell Angular that you have checked the value, how it works and that it will always be a secure value. However, make sure you have double checked the value because by securing the value you are making the app vulnerable.

To mark a value as secure, you can inject DomSanitizer and follow one of the methods below:

  • bypassSecurityTrustStyle
  • bypassSecurityTrustResourceUrl
  • bypassSecurityTrustScript
  • bypassSecurityTrustUrl
  • bypassSecurityTrustHtml

HTTP security concerns

There are two major concerns with HTTP security: cross-site request forgery (CSRF or XSRF) and cross-site script inclusion ( CSSI or XSSI). Angular is said to be one of the top app development frameworks in 2019 and the reason is its built-in features to secure the apps. Angular has in-built support for the two HTTP concerns for the client side even though it can be taken care of on the server side.

In a CSRF or cross-site request forgery, an attacker deceives a user into visiting a harmful site which sends unauthorised requests to the app’s web page. Therefore, a website must have protection against CSRF by making sure all the requests are sent from the original app and not another website.

In XSSI or cross-site script inclusion, an attacker’s website can read data from the JSON API which can leak important data. To prevent this, servers can use the string “)]}’,\n”.


Regular audit is a must to maintain the security of a web app. The Angular apps must also be audited from time to time. And lastly, make sure the app is always secured by performing the actions mentioned above. Also, timely inspections should be done to remove any dangerous codes that have gotten in.

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